Which of the following sentences is correct?

a. i stayed up all night doing homework; however, i just couldn't concentrate.

b. i stayed up all night doing homework, however i just couldn't concentrate.

c. i stayed up all night doing homework however, i just couldn't concentrate.

d. i stayed up all night doing homework, however. i just couldn't concentrate.

The answer is A: I stayed up all night doing homework; however, I just couldn't concentrate.

Semicolons are used, most commonly, to connect two independent clauses without using a conjunction; however, if a conjunctive adverb is used in the sentence (the most common conjunctive adverbs include however, otherwise, therefore, then, finally, likewise, consequently, nevertheless, moreover, and however) the semicolon helps the conjunctive adverb join the two independent clauses, like in the answer above.

sam knew that staying up late on a weeknight would effect his exam performance the next day. however, he believed that his friends would be mad at him if he didn't join them. peer pressure and the thought of losing his friends scared sam. he planned to meet them for a couple of hours and then leave early to study for the exam.

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